Can Photograph People Through Walls Using Wi-Fi

Wi-Fi can pass through walls. German scientists have found a way to exploit this property to take holograms, or 3D photographs, of objects inside of a room - from outside of the room. 'It can basically scan a room with someone's Wi-Fi transmission.Our method gives you much better images, since we record much more signal. Technology is only in prototype stage at this point, and has limited resolution, but is excited about its promise.'Philipp Holl, a 23- year- old undergraduate physics student at the Technical University of Munich, told. Wi-Fi holography can help rescue workers detect people in rubble left by an earthquake - or spy agencies see if anyone is home. However, it does come with obvious privacy concerns.